Regardless of where you decide to build your start up there will be local dangers. Not sure of the stats but you are probably more likely to get taken out by a drive-by in California, or a mugging/beating in New York than a terrorist in Israel. The stress of knowing there are terror attacks is probably what will get to you first. I don't think the OP mentioned stress/crime free environment as one of his pre-requisites, but if that place exists, please let me know about it.